Gate for draft-chambers of furnaces.



M. A. MALLOY. GATE PoR DRAFT CHAMBERS o1" FURNACES.

APPLICATION FILED AUG. 20, 1910. u 1,058,025. Patented Apr. 1,1913.

J m1411111... 1 ...m n HHH IWW qu INVENTOH WTNESSES.'

Br Arron/vn a gate oi Simplefand inexpensive, construcf Yperpendicular section taken on a line AQA i' vided AWith -a draft-inlet, b, the rim, c, of

of 'the dma. Chamber locate@ below "the Agrate,'.in the type of furnace referred to,

' The wall, a,

'that the main portion of said arm, f, will MARY A. Mentor,A or roR'rILiiD; oancoilr, AssroNoa BY MESN'E AssIGNMENfrs, `To

vv amicaHUDSON.

original application med July'21,"1`e"1' o,=seria1' Noi 573,109. Divided Aand this applicationled- August .20, l

i Spel'ciiiciation of Letters fateiit.

'* Patanteii Apri; 1913.-

. 11910.yserileNaisi-azse' citizen of the 'United Statesand a, resident of Oregon, haveinv'ented a nevv fand Y usefulchamber :faild the door therefor of aA furnaceof the' type described i-n appli'catilori.v for- Letters liat'e'n'tA orfimprove'- tonit willibe noted thatv when "ihe'gat-/or damper .of the draft1chamberjs ologpira' The object' of'fmy, invention is vto provide i tion', and4 one which will ber'QOnYenient-to" operate.

I' attain this object@ the devices illustrated in the accompanying drawings, inV which; i

Figurelrepresents a porti n oithe Wallsaid Wall being provid'ed With'anair aper? ture controlled by aV gate embodying my present invention; Fig. 2 shows the Same portion' of the wall, a-nd` the arm hinge of the construction of thehinge and of the gate supported by such hinge,-the dotted lines showing the permissible and\out'move ment o the gate on its hinge arm While the latter remains; Fig. 4 is another section like Fig 3, butin this view the gate is shown swung open on its hinge; and'Fig. 5 is a ofFig.2.

Aof thedraft chamber of. the furnace, located below the grate, is prowhich is understood to have a ground Aface against which the 'ground rim, d, of the gate, In, abuts when closed. On the interior of the casing, a, ,is provided a hinge-lug,- e, in

which is hinged an arm, f,vbent at g, st

a lug, i, provided-on'th'e interior fof 'thecas-f rim perforations,l p, proportioned relatively to' thefrequired'constant minimum inflow Y bustion chamber, even though-"the lg"ajt e,'-1t,

ence vto 'my said' other-"applicatiori or Let i therefor. provided in'th e"arm,'1lf

Then a greaterl infiofwf'of'air:isv'v'des'ired vthan the' minimum admitted through the per'foratio'ns, p, the'g-ate, n, may be adjusted vas thecircumstances require, by manipulating the screw; and when a'still greater inflow of air-isdesilfed immediately, then by swung Wide open, as illustrated in Fig.' 4.

While I have described my invention as particularly designed'for use as a gate for.

v vided with an opening, of a gate provided.

with an orifice or orifices whichco'mm-uni'- --seiviing the knob, m, of the screw, l, and lifting the arm, f, out of its latchingengagemen t, the gate, n, may be cate with the opening,'whereby toa'dmit a,

predetermined continuous` volume. of air through the opening though the gate be closed against the casing surrounding ltheopening, means for moving the gate toward oifomthe opening, s ald meanslncludlng a bar pivoted lto the casing and a screw mounted in the gate and threaded in the bar, and a lug on the casing with which the bar coperates to form a lock, the screw permitting of the gate being adjusted to admit air in the opening to mingle'with the air admitted through the orifices. l

2. The combination with. a casing provided with an opening, of an'arm hinged to t-he inside of thecasing adjacent the opening and adapted to be swung outward; means for .latching the free end of such arm in place; a gate fitting against the casin ad jacent the opening, and a screw rotatab y secured in the center thereof and projecting inward, said screw being threaded into said arm, and the rim of vsaid gate provided with an orifice, or orifices,` which communicate with the opening whereby 'to admit a predetermined volume of air through the opening though the gate be closed against the casing surrounding-'the opening; and means holding the gate against rotation; the screw permitting of the gate being moved from and against the casing when the said gate is latched.

3. The combination4 withv a casing provided with an opening, a lug on the inside of the casing adjacent the opening, a gate formed with a series of openings inside the line of the edge of the walls of the opening `in the casing,` a latch lever pivoted on the inside of the casing adjacent the opening, the end of said latch having a projection, the latch lever having a central threaded opening and a guide opening, a screw swiveled to the gate Avand fittingv in the threaded opening and adapted to tighten the gate against the casing,the openings in the gate admitting a supply of Aair through the opening in the casing though said gate be closed;`a-pinl=secux:ed to the gate and passing through the guide opening, and a lug on the inside of the casing with which the projection on the latch lever engages. A .4. The combination with a casing provided With an opening, a gate formed with a series of openings inside the line of the edge of the walls of the opening in the casing, a latch lever pivoted on the inside of the` casing adjacent the opening and being of such length as to swing through the opening when the gate is opened, said latch lever having a projection at one end to engage with the lugon the inside of the casing, a guide extending from the gate and engaging the latch lever, and a screw s'wiveled to the ate, said screw engaging athreaded opening formed in the latch lever and adapted to tighten the gate against the casing, the

openings in the gate` admitth1g asupply of air through the opening in the casing though said .gate be closed.

5.'The combination with a casing provided with an opening, of ancarm hinged to.

the casing adjacent the opening and adapted to be swung outward, means for latching the free'end of such arm in place, a gate fitting against the vcasing adj-acent the opening, a

screw` rotatably secured in arm and projecting inwardly, said screw being threaded into said arm, the gate having orifices which communicate with the opening in the casing, whereby to admit a predetermined volume .of air through the opening though the gate be closed against the casing surrounding the opening, and means holdingv the gate against rotation, the screw permitting of the gate. being moved from and against the casing when said gate is latched.

MARY A. MALLoY. [L 8.]

Witnesses GEO. WV. MORGAN,

P. 4ANDRUS. 

